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Highly efficient mirrorless laser-like emission in an organic molecular salt

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3 Author(s)
Bhowmik, Achintya K. ; Photonic Materials Research Laboratory, Auburn University, Alabama 36849 ; Dharmadhikari, Aditya ; Thakur, Mrinal

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Unusually high conversion efficiency in laser-like emission has been observed in solutions of an organic molecular salt, styrylpyridinium cyanine dye, at a low threshold input pulse energy. Pumped with frequency-doubled 55 ps pulses from a Nd:YAG laser, a conversion efficiency as high as 40% was achieved without incorporating external mirrors. The spectrally narrowed output beam was observed to be polarized and having a low divergence. The exceptionally low threshold (≪1 μJ with excitation area ∼5 mm2) and high conversion efficiency at a high molar concentration in spite of a very small photoluminescence quantum efficiency (≪0.3%) can be attributed to the large dipole moments associated with the charge-transfer transitions of these molecules favoring strong cooperative emission. © 2001 American Institute of Physics.

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Applied Physics Letters  (Volume:79 ,  Issue: 6 )